diff --git a/src/collective/elasticsearch/indexes.py b/src/collective/elasticsearch/indexes.py
index e686703..4ae4d8e 100644
--- a/src/collective/elasticsearch/indexes.py
+++ b/src/collective/elasticsearch/indexes.py
@@ -112,6 +112,8 @@ class EKeywordIndex(BaseIndex):
     def extract(self, name, data):
         return data[name] or []
 
+    def create_mapping(self, name):  # NOQA R0201
+        return {"type": "keyword", "index": True, "store": True}
 
 class EFieldIndex(BaseIndex):
     pass